Big Below 15k used that can play loud as heck

In your previous room you were able to get impactful bass at 87dB, but in your new larger room the B&Ws start to run out of steam before you hit 80dB.  These are not particularly loud listening levels.  The B&Ws are not an easy load, but the Parasound JC1 should be more than sufficient to get you above 100dB in near or mid-field listening.  I would not change your loudspeakers until you experiment with loudspeaker and listening position.  I'm guessing, but your room may have a frequency response null in the mid-bass range.  Using your SPL run some frequency sweeps to gain more information.

Happy '22, but when is 'too much' too much?

We're all too familiar with the 'basser vehicle' buzzing as if a bumblebee in a hiccup fit...( C'mon, kidz...Permatex Everything that twists or turns into tight & add a quarter...silicone all that remains...)...  When does the source equipment need to be 'offsite' enough?  NASA launch facilities begin to have relevance; far enough away to not intercept blown capacitors, cable melts, tube flares....any audiomalady that has or could occur within even the illogical.

"It's the end of the world as we know it, and I feel Fine (until something goes *foom*) until the weeping and gnashing of teeth and treasure..." 😏

Personally, I've yet to be offended by the odd oldhvymec ('Bots' that? *L*)
Perhaps just a ketchup pkg, beneath his boot, too messy to stomp despite the desire and delight in the act....*splurt!*   "Dog, clean that up..."

Pin to bottom of chicken coop, starve chickens. (Once upon a millennia, they be lizards....and Big)  Still hungry after all these yearns....

Maybe I'm just shock-proof....comfortably numb...looking to burn out bright.

Play loud and often, how accomplished is just part of the fun.

Into the future, J

Welcome to Botsylvania....

Ohm F5 with built in subs would do it and you could go DBA with current subs or sell to help finance. 

It is funny, when I started out in high end audio wanting loud. But the better my system the less I wanted it. I know this progression had something to do with distortion going down dramatically along the way… I am not sure if my age going up had anything to do with it. I used to keep turning it up to make it more satisfying, now I guess I do the same thing. Late 20’s ~95db… late 60’s ~ 72db.

2nd the vote for large Legacy speakers. I have a pair of Aeris and they are the first speakers that come close to providing the same feeling I used to get when I was involved with SPL car audio competition. Good luck!